Garmin GPSMAP 496 User Manual Page 150
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142 GPSMAP 496 Owner’s Manual
APPendIx > MAP dAtuMs And locAtIon forMAts
Map Datums and Location Formats
Map Datums are based on a mathematical model of the Earth.
What are Map Datums?
A datum is a mathematical model of the Earth that approximates
the shape of the Earth and enables calculations to be carried out in a
consistent and accurate manner. The datum is physically represented
by a framework of ground monuments (such as trig. stations) whose
locations have been accurately measured and calculated on this
reference surface. Lines of latitude and longitude on a map or chart
are referenced to a specic map datum. Every chart has a map datum
reference and the GPSMAP 496 can be set to match most of those
commonly used.
If you are navigating and comparing the GPS coordinates to a map,
chart, or other reference, the map datum in the GPS unit should
be set to the same datum as the map to ensure the most accurate
navigation.
What is a Location Format?
Your current location can be viewed on the GPS in the form of
coordinates. Since different maps and charts use different location
formats, Garmin GPS units allow you to choose the correct
coordinate system for the type of map you are using. The most
common format is latitude and longitude, which is used by all
Garmin units. You can change the location format to use with other
coordinate systems in Location Preferences. UTM/UPS (Universal
Transverse Mercator/Universal Polar Stereographic) are easy-to-use
metric grids that are found on most USGS topographic quadrangle
maps. Several other grids, including a user-denable grid (for the
advanced user), are available.
For more information about using paper maps with your
Garmin unit, refer to Using a Garmin GPS with Paper Land
Maps, available for download at www.garmin.com/manuals/
UsingaGarminGPSwithPaperLandMaps_Manual.pdf.
- Owner’s Manual 1
- IntroductIon 3
- Table of Contents 4
- Warnings 6
- Battery Warnings 7
- Important Information 7
- Care Information 8
- GettInG Started 9
- Charging the GPSMAP 496 10
- Turning On the GPSMAP 496 11
- Getting Satellite Signals 12
- Receiver Status 13
- GPS Tab Options 14
- GPS Tips 14
- Learning About the Keypad 15
- Using the GPSMAP 496 16
- GPSMAP 496 Owner’s Manual 9 17
- On-Screen Button 17
- GPSMAP 496 Databases 18
- MapSource Detailed Maps 18
- Simulator Mode 19
- Entering a New Location 20
- Aviation Mode Page Sequence 21
- Creating a Direct To 22
- Go To Page: Recent Tab 23
- Airport Tab of Details Page 24
- Usage Restrictions Page 24
- Finding a Nearby Point 25
- Information Page for a VOR 26
- ARTCC Tab 27
- Nearest Pages: Airspace Tab 28
- Setting Airport Criteria 29
- Selecting an Approach 30
- Understanding Vectors 31
- Finding Points on Land 32
- Marking a Waypoint 33
- Following your Flight Plan 35
- Map Page 36
- Map Orientation 37
- Selecting Map Ranges 37
- Panning the Map 38
- Smart Airspace 39
- Airspace Information 39
- Measuring Distance 40
- Setting the Bug Indicator 41
- Setting Up the Map Page 41
- Changing a Data Field 42
- Additional Map Data 43
- Terrain Page 44
- Terrain Warning 45
- Shown on the Panel Page 45
- Terrain Page Options Menu 45
- Terrain Setup Page 46
- Panel Page 47
- Setting Up the Panel Page 48
- Manually Setting a Course 48
- VNAV (Vertical Navigation) 49
- Active Route Page 51
- Position Data Page 52
- Flight Log 53
- Aircraft Information 54
- Weight & Balance Tab 55
- To calculate winds aloft: 57
- Automotive Mode Page Sequence 58
- Navigating in Automotive Mode 59
- Waypoint Page 60
- Finding an Item 61
- Recently Found Items 62
- Viewing the Information Page 63
- Find Menu Options 63
- Creating Routes 64
- Creating Waypoints 66
- Map Feature Information Page 67
- Following an Automotive Route 69
- Editing Your Route 70
- Creating a Detour 71
- Highway Page 73
- Highway Page Options 74
- Current Route Page 75
- Trip Computer 76
- Editing and Managing Routes 77
- Navigating a Saved Route 78
- Editing a Route 78
- To add points to the route: 79
- To edit the route on the map: 80
- Waypoint Review Page 81
- Points Tab in the Main Menu 81
- Name eldSymbol eld 82
- Adding a Waypoint to a Route 83
- Projecting a Waypoint 84
- Managing Points 86
- User Points Tab 86
- Deleting Waypoints 87
- Proximity Points 88
- To add a proximity waypoint: 89
- Managing Your Tracks 90
- To clear the track log: 91
- To save the entire track log: 91
- Saved Sub Tab 92
- Navigating a Saved Track 93
- TracBack Tips 93
- Marine Mode Page Sequence 94
- Navigating in Marine Mode 95
- Compass Page 97
- Using the Marine Timer 98
- DSC Page 99
- Understanding Distress Calls 100
- Receiving DSC Calls 100
- DSC Call List 101
- Setting up DSC 103
- MaIn Menu 104
- Track Tab 105
- Route Tab 105
- Points Tab 105
- Sonar Tab 106
- Aircraft Tab 106
- Alarms Tab 107
- MAIn Menu > AlArMs tAb 108
- System Alarms Sub Tab 109
- Celestial Tab 110
- Tide Sub Tab 111
- AIn Menu > celestIAl tAb 112
- Hunt & Fish Sub Tab 113
- Message Tab 114
- Display Tab 115
- Sound Tab 116
- Setup Tab 117
- VNAV Sub Tab 118
- Road Routing Sub Tab 118
- Guidance Sub Tab 119
- Timers Sub Tab 120
- Time Sub Tab 121
- Units Sub Tab 121
- Location Sub Tab 122
- Welcome Sub Tab 123
- Interface Sub Tab 123
- MAIn Menu > setuP tAb 124
- AIn Menu > setuP tAb 125
- Advanced NMEA Output Setup 126
- SettInG up and uSInG Sonar 127
- Using the Sonar Page 128
- Adjusting the Sonar Page 129
- Resizing the Split Screen 131
- Setting Up the Sonar Page 132
- Calibrating the Water Speed 133
- Setting Up the Sonar Display 134
- 20' 135
- 10' 135
- Transducer Coverage 136
- Whiteline 137
- Thermoclines 137
- Reset the Temperature Graph 138
- Specications 140
- Optional Accessories 141
- Installation Information 142
- USB cable to the computer 143
- Interfacing 145
- Removing the GPS Antenna 146
- Learning About GPS 147
- LORAN TD Setup 148
- What are Map Datums? 150
- What is a Location Format? 150
- Jeppesen Database Information 152
- Messages 153
- PPendIx > MessAges 154
- Data Field Options 155
- Software License Agreement 157
- Product Registration 157
- Contact Garmin 157
- Limited Warranty 158
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